Investigating the Properties of Water lab by: KAyla moran and paige goddard

In our experiment we tested the polarity of water when adding salt and oil to it. After we added the salt to the beaker, it sunk to the bottom and some dissolved, and the water in the beaker turned gray. When we added the oil, it floated to the top and formed oil bubbles, the more you mixed the more bubbles formed. Also the oil bubbles that formed didn't stick together, and the oil didn't dissolve in the water.

As a part of this lab we tested to see how many drops of water could stay on the front of the penny, we are testing cohesion. We were first asked to guess how many drops could fit, we guessed somewhere around 35, our hypothesis was supported the average of the drops was 31.5 drops on the penny.

During this lab we also learned about surface tension which is the tension of a surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid. The example that we did in class is when you fill a beaker all the way to the top with water and slide a paper clip on to the top. This showed how surface tension was allowing the paperclip to sit on the top of the water instead of sinking or floating.

Adhesion is when molecules stick together. In this lab we learned about adhesion when used a dropper to to put drops of water onto a penny and they all stuck together when a certain of drops were on the penny.

Credits:

Created with images by Pezibear - "raspberry toothpick glass" • aitoff - "wet leaf droplets" • quapan - "rose hips mirrored by a waterdrop"

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